부산대학교 도서관

An empirical formula to estimate Rayleigh scattering cross-section of gamma rays depending on photon energy and momentum transfer involved was first developed by Nath and Ghose by considering the available theoretical and experimental cross-section values. With availability of accurate cross section values in recent times by using large volume Ge(Li) detectors it becomes necessary to recheck the existing formula. A reasonable difference in cross-section values was observed in the region where theoretical calculations are not available due to the uncertainties in earlier measurements. An analytical formula of coherent scattering cross-sections of photons valid for photon energy below 1.5 MeV and up to momentum transfer 2.0 in units of mc has been developed. The calculated values for different photon energies have been compared with experimental results and is in good agreement within experimental uncertainty.